Hi @Camilopq, Thank you for reaching out to us through our Community Forums! Please be aware that Nitro serial number is tied up based on its version. A Nitro Pro 9 serial number can only be applied on a Nitro Pro 9 software. Applying Nitro Pro 9 license to a different version will generate an activation error message '-22 Error: Wrong License Number'. With that, I recommend to uninstall Nitro Pro 12 on your new computer then install Nitro Pro 9 so you can activate it using your v